Preheat oven to 450°. In a small bowl, combine all of the ingredients. Spoon batter into 6 muffin cups coated with cooking spray. Bake until a toothpick comes out clean, 12-14 minutes. Cool for 5 minutes before removing from pan to a wire rack. Serve warm.
As a substitute for 1 cup of self-rising flour, place 1-1/2 teaspoons baking powder and 1/2 teaspoon salt in a measuring cup. Add all-purpose flour to measure 1 cup.